CN115823349A - External circular cutting jacking pipe construction method - Google Patents
External circular cutting jacking pipe construction method Download PDFInfo
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- CN115823349A CN115823349A CN202211282325.4A CN202211282325A CN115823349A CN 115823349 A CN115823349 A CN 115823349A CN 202211282325 A CN202211282325 A CN 202211282325A CN 115823349 A CN115823349 A CN 115823349A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a construction method of an external ring-cut jacking pipe, which comprises a socket pipe and a steel blade assembly fixed at one end of the socket pipe penetrating into the stratum, wherein a working pit for accommodating the socket pipe is arranged on the stratum, a cast-in-situ reaction wall is arranged at one side of the interior of the working pit, which is far away from the steel blade assembly, and a driving assembly for pushing the socket pipe to push the stratum is fixed on the cast-in-situ reaction wall. Has the advantages that: according to the invention, the accommodating frame for accommodating a plurality of groups of jacking iron plates is arranged above the oil cylinder as the jacking mechanism, and the jacking iron plates stacked in the accommodating frame automatically fall down while the oil cylinder returns oil to shrink, so that no additional jacking iron needs to be carried manually, the complexity of operation that the existing jacking iron needs to be fixed to avoid collapse of the jacking iron is improved, the influence of manual repeated installation of the jacking iron on the construction efficiency is avoided, the operation is simple, manual approach of the additional jacking iron in the jacking process of the jacking pipe is not needed, the use is safer, and the jacking efficiency of the jacking pipe is improved.
Description
Technical Field
The invention relates to the field of pipe jacking construction, in particular to a pipe jacking construction method with external circular cutting jacking.
Background
The pipe jacking construction is a non-excavation construction method, and is a pipe burying construction technology without excavation or with few excavation, the pipe jacking construction is that a pipe is jacked into soil according to a designed gradient by means of jacking equipment in a working well, and then a second pipe is jacked continuously after the pipe is jacked into the soil layer, the principle is that a tool pipe is pushed into a receiving pit from the working pit through the soil layer by means of the thrust of a main jacking oil cylinder and the thrust between the pipe and the relay, the pipe is buried between the two pits, the jacking iron is a device for transmitting and dispersing the jacking force, and the pipe is carried by manpower in the using process.
Disclosure of Invention
The invention aims to solve the problems and provide a pipe jacking construction method for external circular cutting jacking, which is safer to use and improves the jacking efficiency of the pipe jacking, and is explained in detail below.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a pipe-jacking construction method of external circular cutting jacking, which comprises the following steps;
step (1): designing a pipe jacking construction device, wherein the pipe jacking construction device comprises a socket pipe and a steel blade assembly fixed at one end of the socket pipe penetrating into the stratum, a working pit for accommodating the socket pipe is arranged on the stratum, a cast-in-situ counter-force wall is arranged at one side of the interior of the working pit, which is far away from the steel blade assembly, and a driving assembly for pushing the socket pipe to push into the stratum is fixed on the cast-in-situ counter-force wall;
the socket pipe is close to steel sword foot subassembly one end is provided with round annular plug, the socket pipe other end is provided with the bell and spigot that is used for pegging graft the adjacent socket pipe plug, steel sword foot subassembly includes that three groups constitute the arc steel sheet of ring form ring cutting edge jointly, and adjacent two sets of steel sheet inboards all are fixed with the channel-section steel that is parallel to each other, and equal fixedly connected with double reinforcing bolt between the adjacent two sets of channel-section steel, three groups the steel sheet inboard be provided with cramp in the sealing washer in the plug outside.
The side is provided with two sets of C shape guide rails that the opening is relative around the inside of work hole, and this guide rail top is close to drive assembly one side is provided with lower plate groove, just the guide rail top is close to steel sword foot subassembly one side is provided with the upper plate groove, lower plate groove top the work hole is inside to be fixed with the holding frame, the holding frame is vertical intercommunication the link-up structure in lower plate groove, the inside vertical pile-up of this holding frame has placed multiunit top iron plate.
The driving assembly comprises a plurality of groups of oil cylinders which are longitudinally arranged and fixed on the cast-in-place reaction wall, the telescopic ends of the oil cylinders are longitudinally connected with a bearing plate for pushing the socket pipe to move, and the top side of the bearing plate is far away from the socket pipe and extends to form a limiting plate for supporting the top iron plate.
Step (2): the method comprises the steps of digging a starting well in a working pit, adopting an open-cut sequential method, excavating in sections, supporting in sections, constructing a reinforced concrete bottom plate by using reinforced concrete on peripheral retaining walls, then constructing a cast-in-place counterforce wall, installing two groups of guide rails which are distributed in parallel in the working pit according to actual three-dimensional space positions, installing a containing frame in the working pit above an upper plate groove of each guide rail, and stacking a plurality of groups of top iron plates in the containing frame.
And (3): an oil cylinder is installed on a cast-in-place counter-force wall to serve as a pushing jack, a limiting plate on a bearing plate at the telescopic end of the oil cylinder serves as a supporting structure for blocking a top iron plate from falling, then a socket pipe produced in a prefabricating mode is hung in a working pit, and the telescopic end of the oil cylinder extends to further push the socket pipe to extend into a soil layer under the guiding cutting effect of a steel blade foot assembly at the end portion of the socket pipe through the bearing plate.
And (4): after the oil cylinder extends out to the maximum stroke, the telescopic end of the oil cylinder contracts, the oil cylinder drives the bearing plate and the limiting plate to move towards the direction away from the socket pipe until the limiting plate moves to a state of separating from a top iron plate in the containing frame, the supporting effect of the top iron plate is relieved at the moment, a plurality of groups of vertically stacked top iron plates simultaneously drop downwards, a group of bottom iron plates fall into two groups of guide rails along a lower plate groove, the group of top iron plates are positioned between the telescopic end of the oil cylinder and the socket pipe, the oil cylinder in the contraction state extends again at the moment, and the fallen group of top iron plates are used as an extension stress part, so that the second jacking action is completed.
And (5): when the socket pipe is pushed in for the second time, the oil cylinder reaches the maximum extension stroke again, the oil cylinder contracts to drive the bearing plate and the limiting plate to return, the lowest group of top iron plates in the containing frame continuously fall into the guide rail along the lower plate groove, so that the top iron plates automatically fall down in the process of the extending and retracting actions of the oil cylinder, the length of the top iron is continuously added, the multiple groups of top iron plates sequentially fall end to transmit pipe pushing power, and a worker sequentially takes out the multiple groups of top iron plates along the upper plate groove until the socket pipe is completely pushed into the soil layer, so that the pushing process of one section of socket pipe is completed.
By adopting the technical scheme, when the socket pipe is jacked into the soil layer, firstly, steel blade feet are arranged at the end part of the socket pipe, three groups of steel plates are spliced and tightly abutted to the outer circumference side of the inserting pipe of the socket pipe through channel steel butt joints, and adjacent and tightly abutted channel steel are locked and connected through reinforcing bolts, so that the splicing and combining process of the three groups of steel plates is realized; the sealing ring sleeved at the joint of the outer side of the plug and the inner side of the steel plate increases the sealing property of the joint of the steel blade foot assembly and the socket pipe so as to take the outer side of the steel plate as a jacking cutting edge of the steel blade foot, thereby facilitating the cutting and breaking of soil layers in the culvert of the soil layer through the cutting edge at the outer side of the steel plate and facilitating the guidance of the socket pipe jacking into the soil layers.
As an important design of the scheme, in the step (1), the double rows of reinforcing bolts are M12 bolts, the number of the double rows of reinforcing bolts is eight, the reinforcing bolts are transversely and uniformly distributed in two rows, and the front end part of the outer side of the steel plate is provided with a 45-degree edge groove.
By adopting the structure, the edge bevel of the front end part of the outer side of the steel plate is 45 degrees, the edge bevel of the steel edge assembly is used as a soil cutting and feeding structure of the forefront group of socket pipes, and the synchronous jacking function of breaking a soil layer to guide the end-to-end connection of a plurality of groups of socket pipes on the rear side is born, so that the pipe wall jacking resistance and the friction resistance of the reinforced concrete socket pipes are reduced during the pipe jacking construction operation, the construction efficiency is improved, and the steel plate jacking pipe has better applicability, economy and operability.
Preferably, in the step (1), an L-shaped reaction force dispersing frame abutting against the inner bottom side of the working pit is arranged on one side, away from the socket pipe, of the cast-in-place reaction force wall, and right-angled triangle reinforcing ribs are arranged on the inner side of the reaction force dispersing frame;
the bearing frame is characterized in that two groups of mounting frames are fixed to the front side and the rear side of the top of the bearing frame, the top of each mounting frame is close to the inner side wall of the working pit and extends in the direction, and mounting grooves for supporting the mounting frames are formed in the front side and the rear side of the top of the working pit.
Preferably, in the step (1), the thickness of the top iron plate is greater than the vertical height of the bearing plate, sliding grooves for supporting the top iron plate to vertically slide are formed in the front side and the rear side of the inside of the containing frame, and the distance between the two groups of sliding grooves is equal to the longitudinal width of the opening of the lower plate groove.
Preferably, in step (2), the guide rail below the inside front and back lateral symmetry of work pit is provided with two sets of support bracket that support the socket pipe, support the bracket including transversely being fixed in crossbeam on the work pit inner wall, the crossbeam is the C shape framework of opening up, and this crossbeam top has the multiunit to rotate the seat along its length direction equipartition, it has the deflector roll to rotate the seat and go up normal running fit, the deflector roll outside with the outer circumference side of socket pipe supports tightly mutually.
Preferably, two ends of the guide rail are respectively fixed on the inner side wall of the working pit and the cast-in-place reaction wall through expansion bolts, and the opening widths of the upper plate groove and the lower plate groove are larger than the width of the top iron plate.
Preferably, in the step (2), the pressure-bearing plate and the limiting plate are both made of Q345B steel and are fixed by welding, and the limiting plate and the pressure-bearing plate are fixed at the output end of the oil cylinder through bolts.
Preferably, the steel plate is a Q345B steel material with the thickness of 5mm, the outer side of the steel plate is flush with the outer circumferential side of the socket pipe, the yield strength of the channel steel is greater than or equal to 345N/mm, the tensile strength is 470-630 Mpa, and the impact energy is greater than or equal to 34 kJ/m.
Preferably, in the step (3), the socket pipe is a reinforced concrete prefabricated pipe structure, the wall thickness of the socket pipe is 120mm, and the outer circumferential side of the steel plate of the steel blade foot assembly is flush with the outer wall of the socket pipe.
In conclusion, the invention has the beneficial effects that: the holding frame that holds multiunit top iron plate is set up above the hydro-cylinder as jacking mechanism, through the top iron plate of stack in the holding frame automatic whereabouts in the shrink of hydro-cylinder oil return to need not artifical transport and add the top iron, and improved current top iron and need fix in order to avoid its complex operation nature that collapses from, easy operation, push pipe jacking in-process need not the manual work and is close to and adds the top iron, uses safelyr, improves push pipe jacking efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a top view of the present invention;
FIG. 2 is a schematic perspective view of the present invention;
FIG. 3 is a schematic structural breakdown of the present invention;
FIG. 4 is a schematic partial structural split of the present invention;
FIG. 5 is a schematic view of the socket pipe of the present invention;
FIG. 6 is a schematic structural disassembly view of the steel blade foot assembly of the present invention;
FIG. 7 is a schematic perspective view of the drive assembly of the present invention;
FIG. 8 is a perspective view of the support bracket of the present invention.
The reference numerals are illustrated below:
1. an earth formation; 101. a working pit; 102. mounting grooves; 2. inserting pipes; 201. a plug; 202. a bearing head; 3. a steel blade foot assembly; 301. a steel plate; 302. a seal ring; 303. channel steel; 303a, a reinforcing bolt; 4. a counterforce wall is cast in place; 401. a counter-force dispersing rack; 5. a drive assembly; 501. an oil cylinder; 502. a pressure bearing plate; 502a and a limiting plate; 6. an accommodating frame; 601. jacking the iron plate; 602. a mounting frame; 7. a guide rail; 701. a lower plate groove; 702. an upper plate groove; 8. a support bracket; 801. a cross beam; 802. a rotating seat; 803. and a guide roller.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1 to 8, the invention provides a pipe-jacking construction method of external circular cutting jacking, which comprises the following steps;
step (1): the design provides a pipe jacking construction device, which comprises a socket pipe and a steel blade assembly fixed at one end of the socket pipe penetrating into the stratum, wherein the steel blade assembly is used for breaking a soil layer to guide the socket pipe to jack into the soil layer, a working pit for accommodating the socket pipe is arranged on the stratum, a cast-in-situ counter-force wall is arranged on one side of the steel blade assembly far away from the inside of the working pit, and a driving assembly for pushing the socket pipe to push into the stratum is fixed on the cast-in-situ counter-force wall.
The socket pipe is close to steel sword foot subassembly one end is provided with the ring form plug, the socket pipe other end is provided with the socket head that is used for pegging graft the adjacent socket pipe plug of cooperation to through plug and socket head grafting cooperation, thereby realize thereby accomplishing the push pipe construction in the multiunit socket pipe end to end connection jacking soil layer, steel sword foot subassembly includes that three groups constitute the arc steel sheet of ring form annular ring cutting edge jointly, and adjacent two sets of steel sheet inboards all are fixed with the channel-section steel that is parallel to each other, and the double reinforcing bolt of equal fixedly connected with between adjacent two sets of channel-section steels, three groups the steel sheet inboard be provided with cramp in the sealing washer in the plug outside utilizes the sealing washer to increase the sealed effect of steel sword foot subassembly and socket pipe department of meeting.
The side is provided with two sets of C shape guide rails that the opening is relative around the work hole is inside, and this guide rail top is close to drive assembly one side is provided with lower plate groove, just the guide rail top is close to steel sword foot subassembly one side is provided with the upper plate groove, lower plate groove top the work hole is inside to be fixed with the holding frame, the holding frame is vertical intercommunication the link up structure in lower plate groove, the inside vertical pile up of this holding frame has placed multiunit top iron plate, and top iron plate is used for setting up between flexible end of hydro-cylinder and socket pipe, and top iron plate is as the power transmission device that the transmission hydro-cylinder pushed away socket pipe power.
The driving assembly comprises a plurality of groups of oil cylinders which are longitudinally arranged and fixed on the cast-in-place counter-force wall, the telescopic ends of the oil cylinders are longitudinally connected with bearing plates for pushing the socket pipe to move, the top side of each bearing plate is far away from the socket pipe and extends in the direction to form a limiting plate for supporting the top iron plate, and the top iron plate in the containing frame is supported through the limiting plate.
Step (2): a starting well is dug in a working pit, an open-cut forward construction method is adopted, segmental excavation and segmental support are carried out, the construction safety of the working pit is ensured, a reinforced concrete bottom plate is constructed by adopting reinforced concrete on the peripheral protective walls, then a cast-in-place counterforce wall is constructed, two groups of guide rails which are distributed in parallel are installed in the working pit according to the actual three-dimensional space position, a containing frame is installed in the working pit above an upper plate groove of the guide rails, a plurality of groups of top iron plates are stacked in the containing frame, and the containing frame is used as a containing structure for supporting the top iron plates.
And (3): and an oil cylinder is arranged on the cast-in-situ counter-force wall and used as a propelling jack, a limiting plate on a bearing plate at the telescopic end of the oil cylinder is used as a supporting structure for blocking the top iron plate from falling, then the prefabricated socket pipe is hung in the working pit, and the telescopic end of the oil cylinder is extended to push the socket pipe to extend into a soil layer under the guiding cutting action of a steel blade foot assembly at the end part of the socket pipe through the bearing plate.
And (4): after the hydro-cylinder stretches out the biggest stroke, the flexible end of hydro-cylinder contracts, the hydro-cylinder drives bearing plate and limiting plate and removes to keeping away from socket joint pipe direction, until the limiting plate remove with the holding frame in the top iron plate detached state, the supporting role that the top iron plate received this moment relieves, the vertical top iron plate that stacks of multiunit drops downwards simultaneously, a set of top iron plate in the below falls into two sets of guide rails along the hypoplastron groove, this group top iron plate be located the flexible end of hydro-cylinder and socket joint between the pipe, the hydro-cylinder of contraction state extends once more this moment, with a set of top iron plate that utilizes to fall down as extension atress part, thereby accomplish the action of pushing up of secondary push pipe.
And (5): when the socket pipe is pushed in for the second time, the oil cylinder reaches the maximum extension stroke again, the oil cylinder contracts to drive the bearing plate and the limiting plate to return, the lowest group of top iron plates in the containing frame continuously fall into the guide rail along the lower plate groove, so that the top iron plates automatically fall down in the process of the extending and retracting actions of the oil cylinder, the length of the top iron is continuously added, the multiple groups of top iron plates sequentially fall end to transmit pipe pushing power, and a worker sequentially takes out the multiple groups of top iron plates along the upper plate groove until the socket pipe is completely pushed into the soil layer, so that the pushing process of one section of socket pipe is completed.
By adopting the technical scheme, when the socket pipe is jacked into the soil layer, firstly, steel blade feet are arranged at the end part of the socket pipe, three groups of steel plates are spliced and tightly abutted to the outer circumference side of the inserting pipe of the socket pipe through channel steel in a butt joint mode, and adjacent abutted channel steel is locked and connected through reinforcing bolts, so that the splicing and combining process of the three groups of steel plates is realized; the sealing ring sleeved at the joint of the outer side of the plug and the inner side of the steel plate increases the sealing performance of the joint of the steel blade assembly and the socket pipe, so that the outer side of the steel plate serves as a jacking cutting edge of the steel blade, and the soil layer inside the culvert of the soil layer is cut and broken through the cutting edge at the outer side of the steel plate, so that the socket pipe is guided to jack into the soil layer, the friction force of the socket pipe jacking into the soil layer is reduced, and the pipe jacking efficiency is improved.
As an important design of the scheme, in the step (1), the two rows of reinforcing bolts are M12 bolts, the number of the two rows of reinforcing bolts is eight, the reinforcing bolts are transversely and uniformly distributed in two rows, and the front end part of the outer side of the steel plate is provided with a 45-degree edge groove.
By adopting the structure, the edge bevel of the front end part of the outer side of the steel plate is 45 degrees, the edge bevel of the steel edge assembly is used as a soil cutting and feeding structure of the forefront group of socket pipes, and the synchronous jacking function of breaking a soil layer to guide the end-to-end connection of a plurality of groups of socket pipes on the rear side is born, so that the pipe wall jacking resistance and the friction resistance of the reinforced concrete socket pipes are reduced during the pipe jacking construction operation, the construction efficiency is improved, and the steel plate jacking pipe has better applicability, economy and operability.
As a preferable technical scheme of the scheme, in the step (1), an L-shaped reaction force dispersing frame abutting against the inner bottom side of the working pit is arranged on one side, away from the socket pipe, of the cast-in-place reaction force wall, right-angled triangle reinforcing ribs are arranged on the inner side of the reaction force dispersing frame, and the cast-in-place reaction force wall is matched with the reaction force dispersing frame to support the oil cylinder, so that the stability of the process of jacking the oil cylinder into the socket pipe is improved; the bearing frame is characterized in that two groups of mounting frames are fixed to the front side and the rear side of the top of the bearing frame, the top of each mounting frame is close to the inner side wall of the working pit and extends in the direction, and mounting grooves for supporting the mounting frames are formed in the front side and the rear side of the top of the working pit. The top iron plate thickness is greater than the vertical height of bearing plate, after a set of top iron plate fell into the guide rail along the lower board groove, utilize the bearing plate top to push away this group of top iron plate and support socket pipe jacking, ensure that the limiting plate on bearing plate top side can continue to support a plurality of groups top iron plates this moment, the side all is provided with the spout that supports the vertical slip of top iron plate around the holding frame is inside, and is two sets of the spout interval with the vertical width of lower board groove opening equals, ensures that top iron plate can follow the spout and move down and fall into the guide rail along the lower board groove.
In step (2), the inside front and back lateral symmetry of work hole below the guide rail is provided with the support bracket of two sets of support socket pipe, support bracket is including transversely being fixed in crossbeam on the work hole inner wall, the crossbeam is the C shape framework that the opening faces upwards, and this crossbeam top has the multiunit to rotate the seat along its length direction equipartition, it has the deflector roll to rotate the seat and go up normal running fit, the deflector roll outside with the outer circumferencial side of socket pipe supports tightly mutually, and then is convenient for support the socket pipe sideslip through the deflector roll on the crossbeam, improves the stationarity that the socket pipe top advances into the soil layer, the guide rail both ends are fixed in respectively through expansion bolts the work hole inside wall with on the cast-in-place counter-force wall, just the upper plate groove with lower plate groove opening width all is greater than the top iron plate width, ensures that top iron plate can smoothly get through upper plate groove and lower plate groove and put the action of putting. In the step (2), the bearing plate and the limiting plate are made of Q345B steel and are fixed by welding, so that the structural strength of the limiting plate of the bearing plate is ensured, the limiting plate and the bearing plate are fixed at the output end of the oil cylinder through bolts, the steel plate is made of Q345B steel with the thickness of 5mm, the outer side of the steel plate is flush with the outer circumferential side of the socket pipe, the yield strength of the channel steel is not less than 345N/mm, the tensile strength is 470-630 MPa, the impact energy is not less than 34kJ/m, the structural strength of the channel steel is ensured to support the socket pipe to jack into the soil layer, the external force applied to the end part in the jacking process of the pipeline is overcome, and the overall rigidity and the stability of the pipeline are ensured.
Further, in the step (3), the socket pipe is of a reinforced concrete prefabricated pipe structure, the wall thickness of the socket pipe is 120mm, and the outer circumferential side of the steel plate of the steel blade foot assembly is flush with the outer side wall of the socket pipe.
The holding frame that holds multiunit top iron plate is set up above the hydro-cylinder as the mechanism that advances in top, through the top iron plate of stack in the holding frame automatic whereabouts in the shrink of hydro-cylinder oil return, add the top iron in order not to need not artifical transport, and improved current top iron need be fixed in order to avoid its complex operation nature that collapses from, avoid artifical repeated installation top iron to produce the influence to the efficiency of construction, moreover, the steam generator is simple in operation, the push pipe advances the in-process and need not the manual work and be close to and add the top iron, it is safer to use, the efficiency of advancing in the push pipe is improved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A pipe jacking construction method of external circular cutting jacking is characterized in that: comprises the following steps;
step (1): designing a pipe-jacking construction device, wherein the pipe-jacking construction device comprises a socket pipe and a steel blade assembly fixed at one end of the socket pipe penetrating into the stratum, a working pit for accommodating the socket pipe is arranged on the stratum, a cast-in-situ reaction wall is arranged at one side of the interior of the working pit, which is far away from the steel blade assembly, and a driving assembly for pushing the socket pipe to advance into the stratum is fixed on the cast-in-situ reaction wall;
step (2): digging a starting well in a working pit, adopting an open-cut sequential method, excavating in sections, supporting in sections, constructing a reinforced concrete bottom plate by using reinforced concrete on peripheral retaining walls, then constructing a cast-in-place counterforce wall, installing two groups of guide rails which are distributed in parallel in the working pit according to actual three-dimensional space positions, installing a containing frame in the working pit above an upper plate groove of each guide rail, and stacking a plurality of groups of top iron plates in the containing frame;
and (3): installing an oil cylinder on a cast-in-place counter-force wall to serve as a pushing jack, using a limiting plate on a bearing plate at the telescopic end of the oil cylinder to serve as a supporting structure for stopping a top iron plate from falling, then hoisting a socket pipe produced in a prefabricating mode into a working pit, and using the telescopic end of the oil cylinder to extend so as to push the socket pipe to extend into a soil layer under the guiding cutting action of a steel edge foot assembly at the end part of the socket pipe through a bearing plate;
and (4): after the oil cylinder extends to the maximum stroke, the telescopic end of the oil cylinder contracts, the oil cylinder drives the bearing plate and the limiting plate to move towards the direction away from the socket pipe until the limiting plate moves to a state of being separated from a top iron plate in the containing frame, at the moment, the supporting effect on the top iron plate is relieved, a plurality of groups of vertically stacked top iron plates simultaneously drop downwards, a group of top iron plates at the lowest part fall into two groups of guide rails along a lower plate groove, the group of top iron plates are positioned between the telescopic end of the oil cylinder and the socket pipe, at the moment, the oil cylinder in the contracted state extends again, and the group of top iron plates which fall are used as stress extension parts, so that the second jacking action of the top pipe is completed;
and (5): when the socket pipe is pushed in for the second time, the oil cylinder reaches the maximum extension stroke again, the oil cylinder contracts to drive the bearing plate and the limiting plate to return, the lowest group of top iron plates in the containing frame continuously fall into the guide rail along the lower plate groove, so that the top iron plates automatically fall down in the process of the extending and retracting actions of the oil cylinder, the length of the top iron is continuously added, the multiple groups of top iron plates sequentially fall end to transmit pipe pushing power, and a worker sequentially takes out the multiple groups of top iron plates along the upper plate groove until the socket pipe is completely pushed into the soil layer, so that the pushing process of one section of socket pipe is completed.
2. The external circular cutting jacking pipe construction method according to claim 1, characterized in that: in the step (1), one end of the socket pipe, which is close to the steel blade foot assembly, is provided with an annular plug, the other end of the socket pipe is provided with a socket head which is used for being matched with an adjacent socket pipe plug in an inserting mode, the steel blade foot assembly comprises three groups of arc-shaped steel plates which jointly form an annular ring cutting blade, the inner sides of two adjacent groups of steel plates are fixed with mutually parallel channel steel, a double-row reinforcing bolt is fixedly connected between two adjacent groups of channel steel, and the inner sides of the three groups of steel plates are provided with sealing rings which are hooped on the outer side of the plug;
two groups of C-shaped guide rails with opposite openings are arranged on the front side and the rear side inside the working pit, a lower plate groove is formed in one side, close to the driving assembly, of the top of each guide rail, an upper plate groove is formed in one side, close to the steel blade foot assembly, of the top of each guide rail, an accommodating frame is fixed inside the working pit above the lower plate groove, the accommodating frame is a through structure which is vertically communicated with the lower plate grooves, and multiple groups of top iron plates are vertically stacked inside the accommodating frame;
the driving assembly comprises a plurality of groups of oil cylinders which are longitudinally arranged and fixed on the cast-in-place reaction wall, the telescopic ends of the oil cylinders are longitudinally connected with a bearing plate for pushing the socket pipe to move, and the top side of the bearing plate is far away from the socket pipe and extends to form a limiting plate for supporting the top iron plate.
3. The external circular cutting jacking pipe construction method according to claim 1, characterized in that: in the step (1), the double rows of reinforcing bolts are M12 bolts, the number of the double rows of reinforcing bolts is eight, the reinforcing bolts are transversely and uniformly distributed in two rows, and the front end part of the outer side of the steel plate is provided with a 45-degree edge groove.
4. The external circular cutting jacking pipe construction method according to claim 1, characterized in that: in the step (1), an L-shaped reaction force dispersing frame which is tightly propped against the inner bottom side of the working pit is arranged on one side, far away from the socket pipe, of the cast-in-situ reaction force wall, and right-angled triangle reinforcing ribs are arranged on the inner side of the reaction force dispersing frame;
the bearing frame is characterized in that two sets of mounting frames are fixed on the front side and the rear side of the top of the bearing frame, the top of each mounting frame is close to the inner side wall of the working pit, the mounting grooves for supporting the mounting frames are formed in the front side and the rear side of the top of the working pit.
5. The external circular cutting jacking pipe construction method according to claim 1, characterized in that: in the step (1), the thickness of the top iron plate is larger than the vertical height of the bearing plate, sliding grooves for supporting the top iron plate to vertically slide are arranged on the front side and the rear side inside the containing frame, and the distance between the two groups of sliding grooves is equal to the longitudinal width of the opening of the lower plate groove.
6. The external circular cutting jacking pipe construction method according to claim 1, characterized in that: in step (2), the side symmetry is provided with the support bracket of two sets of support socket pipe around the work hole is inside below the guide rail, support the bracket including transversely being fixed in crossbeam on the work hole inner wall, the crossbeam is the C shape framework that the opening faces upwards, and this crossbeam top has the multiunit to rotate the seat along its length direction equipartition, it has the deflector roll to rotate the running fit on the seat, the deflector roll outside with the outer circumferencial side of socket pipe supports tightly mutually.
7. The external circular cutting jacking pipe construction method according to claim 6, wherein the external circular cutting jacking pipe construction method comprises the following steps: two ends of the guide rail are fixed on the inner side wall of the working pit and the cast-in-place counter-force wall through expansion bolts respectively, and the opening widths of the upper plate groove and the lower plate groove are larger than the width of the top iron plate.
8. The external circular cutting jacking pipe construction method according to claim 1, characterized in that: in the step (2), the bearing plate and the limiting plate are both made of Q345B steel and are fixed by welding, and the limiting plate and the bearing plate are fixed at the output end of the oil cylinder through bolts.
9. The external circular cutting jacking pipe construction method according to claim 8, wherein the external circular cutting jacking pipe construction method comprises the following steps: the steel plate is Q345B steel with the thickness of 5mm, the outer side of the steel plate is flush with the outer circumference side of the socket pipe, the yield strength of the channel steel is larger than or equal to 345N/mm, the tensile strength is 470-630 Mpa, and the impact energy is larger than or equal to 34 kJ/m.
10. The external circular cutting jacking pipe construction method according to claim 1, characterized in that: in the step (3), the socket pipe is of a reinforced concrete prefabricated pipe structure, the wall thickness of the socket pipe is 120mm, and the outer circumferential side of a steel plate of the steel blade foot assembly is flush with the outer side wall of the socket pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211282325.4A CN115823349A (en) | 2022-10-19 | 2022-10-19 | External circular cutting jacking pipe construction method |
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| CN202211282325.4A CN115823349A (en) | 2022-10-19 | 2022-10-19 | External circular cutting jacking pipe construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117646638A (en) * | 2024-01-30 | 2024-03-05 | 中铁二十二局集团轨道工程有限公司 | Force transmission construction method by using top pipe reaction frame of existing station main body structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117646638A (en) * | 2024-01-30 | 2024-03-05 | 中铁二十二局集团轨道工程有限公司 | Force transmission construction method by using top pipe reaction frame of existing station main body structure |
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